Hydraulic fluid motor lift mechanism



April 28, 1953 A. s. MURRAY 2,636,348

HYDRAULIC FLUID MOTOR LIFT MECHANISM Original Filed March 31, 1949 2 SHEETSSHEET 1 Fig In ventor Aubrey 5. Murray WW m April 28, 1953 A. s. MURRAY HYDRAULIC FLUID MOTOR LIFT M ECHANISM Original Filed March 31 1949 2 SHEETS-SHEET 2 Inventor Aubrey S. Murray Patented Apr. 28, 1953 HYDRAULIC FLUID MOTOR LIFT MECHANISM Aubrey S. Murray, Elizabethton, Tenn.

Original application March 31, 1949, Serial No. 84,582, now Patent No. 2,601,998, dated July 1,

1950, Serial No. 179,514

7 Claims.

The present invention relates to improvements in hydraulic fluid motor lift mechanisms and is a divisional application of my co-pending application, Serial No. 84,582, filed March 31, 1949, now Patent No. 2,601,998, issued July 1, 1952. My invention relates more particularly tothe type of mechanism which is well adapted to be employed with drafting tables and the like for elevating the same.

The primary object of the present invention is to provide a novel hydraulic fluid motor lift mechanism whereby adjustment in a vertical direction of-various devices may be accomplished.

A further object of the present invention resides in the provision of means for raising and ing with the interior thereof, a tubular column mounted to slide vertically in the standard,

means carried by the upper end of the tubular columnsuch as a table or similar object to be lifted, and lift means within the tubular column and'engaging the underside of the object to be elevated along with the tubular column when fluid is forced from the base into the elevating" means.

Other features include a pump mounted within the base and actuated from the exterior thereof for introducing fluid from the base into the elevating means, a valve connected with the elevating means and communicating with the interior of the base for returning the liquid pumped into the elevating means to the base when it is desired to lower the object supported thereby, and means operable through the hollow base for controlling the valve.

The best form in which I have contemplated applying my invention is illustrated in the accompanying drawings, wherein:

Figure l is a side view of a table embodying the features of the present invention, certain portions being broken away to more clearly illustrate details of construction;

Figure 2 is a horizontal sectional view taken: substantially along the line 2-2 of Figure 1;

Figure 3 is a horizontal sectional view taken.

' substantially along the line 3-3 of Figure 1;

Figure 4, is ahorizontal sectional view taken lift mechanism of the present invention.

Divided and this application August 15,

substantially along the plane of line 44 of Figure 1;

Figure 5 is a vertical transverse sectional view taken substantially along the plane of line 5-5 of Figure 4; and

Figure 6 is a vertical transverse sectional view taken substantially along the plane of line 6-6 of Figure 4.

Referring more particularly to the drawings, wherein like numerals designate like parts throughout, the base is designated generally by the numeral 10 and comprises a bottom I l which is preferably circular in shape and has welded or otherwise secured thereto an upwardly extending cylindrical wall [2 which lies concentric with relation to the outer edge of the bottom II. This wall is provided adjacent its upper end with inwardly extending brackets I3 which are provided with internally screw threaded openings 14 for the reception of suitable attaching screws 15 by means of which a cover It of circular form is detachably connected to the upper edge of the cylindrical side wall l2. This cover It is provided with a centrally located concentric circular opening ll which lies concentric with relation to the wall l2, and welded or otherwise fiXed to the cover I6 in concentric relation in the opening I! is a tubular standard l8 carrying adjacent its upper end an outwardly extending boss l9 having an opening extending therethrough which also extends through the standard 18 as will be readily understood upon reference to Figure 1. Secured in any suitable manner within the standard l8 intermediate its ends is a guide sleeve 2|, and fitted in the upper end of the standard [8 is a guide bushing 22 which is held in place by a radial pin 23, which as illustrated in Figures 1 and 2 projects through the opening 20, and is held therein by a cross pin 24. The inner end of the guide pin 23 projects beyond the inner wall of the bushing 22 and is flattened to form a rectangular guide member 25 by means of which the column to be more fully hereinafter described is held against turning within the standard I8.

Mounted for vertical sliding movement in the guide ring 2| and guide bushing 22 is a tubular column 26 which is provided with an elongated longitudinal groove '21 in which the guide member 25, previously referred to, is received. will thus be seen that the tubular column 26 is mounted for vertical sliding movement within the tubular standard I8 and will form an effective guide for various means to be received thereon for lifting by the hydraulic fluid motor As here shown, and described in my said copending application, Serial No. 84,582, now Patent No. 2,601,998, a pedestal drafting table having a carrying socket and head are mounted on the tubular column 26and within the tubular standard ,..3 l8 which provides a lifting guide therefor. Inasmuch as the pedestal drafting table and universal ball socket joint therefor have been completely described in my copending application, above identified, further description thereof in this application is deemed unnecessary. It should be noted that there are other means that may be mounted on the upper end of the tubular column 26 for lifting thereby. a.

Welded or otherwise fixed to thebottom ll 'of the base it, and in axial alinement'withthe column 26, is a fitting 68 which is provided in its upper face with a vertically extendinginterrial- 1y screw threaded borefiil in which a vertical 'pipe as is, threaded. .f is pe. e nds'urward- 1y within the column 29 to a point near the upper end thereof and supported on the pipe ad- Jjacent, its upper endis a pistonfifl ofa conventional form. As illustrated in iifigure L theupper end of thepipeopensthrough the upper end 'foi "the1piston, and slidably fitted over the piston is an elevating cylinder 68, into the upper end of which isffitted an end closingplug 6 9 having adorns-shaped. upper surface la -The domean d upper u face t n a es h inne en fofthe axialbore in the neck; 41 of the spherical "socket 42. The plug fiiiis sec red in the upper end of theelevating cylinder 68 in such a manner asto form afluid-tight joint so that fluid entering the cylinder through the pipe 58 and con .fined by the 'pistonfi'lf will cause the cylinder T68 to rise upwardly, carrying with item means supported on thetubular column 26,

A suitable by-passiport H is formed in v the Icylinder 68 adjacent its end remote from the *plug 69 and 'serVes to-permit fiuidentering the cylinder through the 'pipeE B to escape and fall downwardly jthrough theeolumn 26 into the reservoir formed by the hollow base lil (Figure 6). The inner endof the bored? communicates with a reduced bore 12 which opens into a transverseboreldformed' in the fitting fit which is interrupted intermediate its ends, and t o o ne 'side. of the bore 12, by an inwardly extending annular rib Hlforming a seat fora ball yalve 15. A feedypipe 16 is 60111318211130 the'bore 7:, to feed liquid into the here on the .side oi thegrib cor s'eatldv remote from the bore lgpanda discharge pipe 77 is coupled to the opposite-end ofuthe bore 13. 7 4 A, suitable pump 18 is mounted on the bottom III within thebase l and'is'provided with an actuating plunger 19 which projects upwardly through the to'p.v N of the base Ill and termi- 1.nates in a head89. The plunger 84 of thepurnp I8 is normally urged'upwardly under;the ef fo rt of a compression coil spring 32 contained within the pump and one port 33 of the pump 18 opens "intothe interior of the hollow base HJ. Asuit- \,ableball valve 843is mounted withinthepump l8 nearthe port'83to prevent fluid which has .i entered the pump with the upestroke of .thepiston r8! fromfalling back'into the base lii when the plunger 8]; ismoveddownwardly against the effort of the spring 32. vjIhe opposite port 85 cf the pump 18 is connected to' the feed pipe 1!; so that by reciprocating the plunger 8| in thepuinp '18, liquidjcontained within the'hollow base M will be'expelled by the'pump through the pipe 16 andinto the'pipe 58 past the ball valve p It will thus be seen that by manipulating the pump, liquid pressure may be'developed within the cylinder 68 above'the piston fi'lf to cause the cy nder to ove. upwa d y'an term herewith the means suppo ed, onv t o umnifixth latter serving as a guide within the guide ring 52! and grime bushing2 2f6f the standard l8 to hold the parts in vertical position.

Fitted to the inner surface of the top I6 of the hqllow base i8 and near the pump 18, is a valve cylinder 86 (Figure 5) having opening 'thereinto a pair of diametrically opposed ports i3], ne of which is coupled through the medium of a dischargepipe l! with the pipe 58. A plunger88 is mounted to slide within the cylinder 8'! lo and'is yieldingly held upwardly under the inf uence ofa compression spring 89. The upper "end ofthe plunger is provided with a shank 90 which-projects upwardly through the top iii of the base It and is equipped with a suitable head 15 Qilqy which the plunger 88 may be moved downwardly against metere 'o'f 'thef'spi ir'ig Q9. ate in the plunger 88 intermediate it's ends is :an annulargroov'e 9'2 emanates thepluhger depressed, aligns with the} ports l; to "estat- 2Q flish communication between thepipe"58ahdthe interior or theho'llow' base I 9.

p un'ipe d into the cy lifider"Sfiirhay I), therefrom through the pipetdfpassge's T2 pipe transmit 8T intomaintain-"5r" the hollow base i 8, for "re-use 'ih' elevating the "cyli i dplrjtdiandits at-ten ant e nis'm. I Whenhydraulic uidlift the present invention "is employed in co'njiihw m t ionwith' a pedestal m nnerisms asfshdwnfthe device maybe transpdrtedwuhtne li' id'i m mase araiehamme base jilj'a d po'n at the place or use; one truest; ews' f5 be removed and the liquid maytlienbe'introduced into'the'holl'ow -basetliiou'gh the screw hole 4 after i /"hie. metered istepia' d I introducing the; desirediquahtity of liquid ihthe hollow base ill, the top ldisieplaced'laiid I'ipon reciprocating thepuin'p"plungr lfit will be evident that fiu'id' willhe extracted hem the m1- g base it "and raised upwarei t'ln-ugh the L pipe" 53 into; thef'c'ylinderffiii" above the piston?! Uponattai'ning the desired height, fiirthr blimping isc asea' and the'fluidwi ihbefheldfinithe cylinder until suchtiirie as'the veneer-anger "83 :'is depressed to align the; Qi'fbdveWQ jports'iii. Upon's'o aligningthegroove,"the ii i truer; 'hasteelf urnpea into the'"cy' l 'iridef88 'will sew backwardly through the spawns into the hollow base l0. g nastier/lane the l'ioll'ow base Hlfse'rves as the resrvoir f or the elevating fiiiid' forliftiiig table tops and other similar means, it will befeiiident that the fluid serveasajjbausst weighting thelbase and thereby 'steady'ing' the" table er the 55 likewhen' snch'is use, A

. I se ne changes inay be "made'in' the tenantstion; aisjarran eheater tlie'fp a'rtsbf myfivi'ce rjwit ertd e f pose of my i yszr'i'tionfa v p memento 6O cover'by 'claiins anyinodifie df bf streefirst use'ofrhechanicalletiiiiyalents"whichiilay be reasonably iincliidedi within the r meshinofut'sa'cr ificingj anyj 'of'ftheadvantages thereof.

Having described the invention, that is claimed as new is: v V

m nute hitte lift iiitilhahism 'dnifirrsiii a lliollou base 'forr ning' a res V011 fo1"--a siibs-t'a-ntia'lly incompressible li'qiiidi d b'ase 'havin'ghn aperture opening through dts 't'op, a tiiblfl'ar sttihdaidcarriedbv the-base and; risifig'ver-tically therefrom "in" axial alignmehtwviththe aperture, -"a"tubular column m'ounted' 'in 'the standard to slide vertically therein; ainemberengaged-in and closing "the upper end 7 of said column, a pipe mounted on the base and extending upwardly therefrom within the column, a piston carried by the pipe within the column, a cylinder sli-dably mounted on the piston and disposed within the column to move vertically on said piston, a head closing the cylinder, said member being removably seated on said head, and manually controlled mean within the base and connected to the pipe to force liquid into the cylinder above the piston and elevate the cylinder.

2. A fluid motor lift mechanism comprising a hollow base forming a reservoir for a substantially incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member received in and closing the upper end of said standard, a pipe mounted in the base and extending upwardly therefrom within the column, a piston carried by the pipe within the column, a cylinder slidably mounted on the piston and disposed axially of and within the column to move vertically on said piston, a head closing the cylinder and engaging said member, manually controlled means within the base and connected to the pipe to force liquid into the cylinder above the piston and elevate the cylinder, and said cylinder having a ,by-pass opening therein in vertically spaced relation to the head to return liquid to the base when a pre-- determined height above the base has been attained.

3. A fluid motor lift mechanism comprising a hollow base forming a reservoir for a substantially incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member supported by and closing the upper end of said column, a pipe mounted in the base and extending upwardly therefrom within the column, a piston carried by the pipe within the column, a cylinder mounted on the piston within the column to move vertically on said piston, a head closing the cylinder, said member being seated on said head, manually controlled means within the base and connected to the pipe to force liquid into the cylinder above the piston and elevate the cylinder, and a manually controlled valve within the and connected to lie pipe to drain liquid from the cylinder and return it to the base.

a. A fluid motor lift mechanism comprising a hollow base forming a reservoir for a substantially incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member supported by and closing the upper end of said column, a pipe mounted in the base and extending upwardly therefrom Within the column, a piston carried by the pipe Within the column, a cylinder mounted on the piston within the column to move vertically on said piston, a head closing the cylinder, said member being removably seated on said head, manually controlled means within the base and connected to the pipe to force liquid into the cylinder above the piston and elevate the cylinder, said cylinder having a by-pass opening therein in vertically spaced relation to the head to return liquid to the base when a predetermined height above the base has been attained, and a m nu l y controlled valve within the base and connected to the pipe to drain liquid from the cylinder and return it to the base.

5. A fluid motor lift mechanism comprising a hollow base forming a reservoir for a substantially incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member supported by and closing the upper end of said column, a pipe mounted in the base and extending upwardly therefrom within the column, a piston carried by the pipe within the column, a cylinder mounted on the piston within the column to move vertically on said piston, a head closing the cylinder, said member being removably seated on said head, a manually actuated pump within the base and connected to the pipe to force liquid from the base and through the pipe into the cylinder to elevate the cylinder.

6. A fluid motor lift mechanism comprising a hollow base forming a reservoir for a substantial- 1y incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member supported by and closing the upper end of said column, a pipe mounted in the base and extending upwardly therefrom within the column, a piston carried by the pipe Within the column, a cylinder mounted on the piston within the column to move vertically on said piston, a head closing the cylinder, said member being removably seated on said head, a manually actuated pump within the base and connected to the pipe to force liquid from the base and through the pipe into the cylinder to elevate the cylinder, and manually controlled valve within the base and connected to the p p to drain liquid from the cylinder.

7. In a device of the type described, a hollow base forming a reservoir for a substantially incompressible liquid, said base having an aperture opening through its top, a tubular standard carried by the base and rising vertically therefrom in axial alignment with the aperture, a tubular column mounted in the standard to slide vertically therein, a member supported by and closing the upper end of said column, a pipe mounted in the base and extending upwardly therefrom within the column, a piston carried by the pipe Within the column, a cylinder mounted on the piston Within the column to move vertically on said piston, a head closing the cylinder, said member being removably seated on said head, a manually actuated pump within the base and connected to the pipe to force liquid from the base and through the pipe into the cylinder to elevate the cylinder, and said cylinder having a by-pass opening remote from the head to drain liquid from the cylinder and return it to the base when a predetermined height above the base has been attained. AUBREY S. MURRAY.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,136,617 Ritter Apr. 20, 1915 1,233,859 Fertig July 17, 1917 1,611,703 Zabriskie Dec. 21, 1926 2,153,845 Rosenberry Apr. 11, 1939 

